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An automated atmospheric radon sampling system
Journal article   Peer reviewed

An automated atmospheric radon sampling system

H. Newstein, L.D. Cohen, R. Krablin and Drexel Univ., Philadelphia
Atmospheric environment, v 5(10), pp 823-831
1971
DOI: https://doi.org/10.1016/0004-6981(71)90012-6
PMID: 5117545

Abstract

An automated radon gas sampling system using the double filter method is described. Four such systems have been installed on a 1000 ft tower in northwest Philadelphia, Pennsylvania, at elevations of 20, 200, 570, and 890 ft above ground. Simultaneous sulfur dioxide concentration measurements are made at the radon sampling elevations together with measurements of wind speed, wind direction, and temperature at elevations of 40, 100, 200, 350, 570, and 890 ft. Average radon concentrations are measured every hour, while the meteorological variables are recorded continuously, with 10 min averages calculated four times an hour. These systems have had a downtime of less than 15 per cent since March, 1970. The radon systems are capable of monitoring radon concentrations with a sensitivity of 10 −14 Ci 1 −1, and an uncertainty at 10 −13 Ci 1 −1 of 7 per cent. The observed average radon concentration at twenty feet above the ground was 1.5 × 10 −13 Ci 1 −1, in substantial agreement with other published values. Data are presented which display the diurnal variation of radon concentration as a function of elevation. Also presented are data which show a radon concentration dependence on wind direction.

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